NFC: Remove unused includes (#133474)

Author: hiraditya

mlir/lib/IR/Verifier.cpp

@@ -31,13 +31,7 @@
 #include "mlir/IR/Operation.h"
 #include "mlir/IR/RegionKindInterface.h"
 #include "mlir/IR/Threading.h"
-#include "llvm/ADT/DenseMapInfoVariant.h"
 #include "llvm/ADT/PointerIntPair.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/Support/FormatVariadic.h"
-#include "llvm/Support/PrettyStackTrace.h"
-#include "llvm/Support/Regex.h"
-#include <atomic>
 #include <optional>
 
 using namespace mlir;